1/*
2 * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB.  If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20#include "config.h"
21#include "SVGTransformDistance.h"
22
23#include "FloatConversion.h"
24#include "FloatPoint.h"
25#include "FloatSize.h"
26#include "SVGTransform.h"
27
28#include <math.h>
29
30namespace WebCore {
31
32SVGTransformDistance::SVGTransformDistance()
33    : m_type(SVGTransform::SVG_TRANSFORM_UNKNOWN)
34    , m_angle(0)
35    , m_cx(0)
36    , m_cy(0)
37{
38}
39
40SVGTransformDistance::SVGTransformDistance(SVGTransform::SVGTransformType type, float angle, float cx, float cy, const AffineTransform& transform)
41    : m_type(type)
42    , m_angle(angle)
43    , m_cx(cx)
44    , m_cy(cy)
45    , m_transform(transform)
46{
47}
48
49SVGTransformDistance::SVGTransformDistance(const SVGTransform& fromSVGTransform, const SVGTransform& toSVGTransform)
50    : m_type(fromSVGTransform.type())
51    , m_angle(0)
52    , m_cx(0)
53    , m_cy(0)
54{
55    ASSERT(m_type == toSVGTransform.type());
56
57    switch (m_type) {
58    case SVGTransform::SVG_TRANSFORM_MATRIX:
59        ASSERT_NOT_REACHED();
60#if ASSERT_DISABLED
61        FALLTHROUGH;
62#endif
63    case SVGTransform::SVG_TRANSFORM_UNKNOWN:
64        break;
65    case SVGTransform::SVG_TRANSFORM_ROTATE: {
66        FloatSize centerDistance = toSVGTransform.rotationCenter() - fromSVGTransform.rotationCenter();
67        m_angle = toSVGTransform.angle() - fromSVGTransform.angle();
68        m_cx = centerDistance.width();
69        m_cy = centerDistance.height();
70        break;
71    }
72    case SVGTransform::SVG_TRANSFORM_TRANSLATE: {
73        FloatSize translationDistance = toSVGTransform.translate() - fromSVGTransform.translate();
74        m_transform.translate(translationDistance.width(), translationDistance.height());
75        break;
76    }
77    case SVGTransform::SVG_TRANSFORM_SCALE: {
78        float scaleX = toSVGTransform.scale().width() - fromSVGTransform.scale().width();
79        float scaleY = toSVGTransform.scale().height() - fromSVGTransform.scale().height();
80        m_transform.scaleNonUniform(scaleX, scaleY);
81        break;
82    }
83    case SVGTransform::SVG_TRANSFORM_SKEWX:
84    case SVGTransform::SVG_TRANSFORM_SKEWY:
85        m_angle = toSVGTransform.angle() - fromSVGTransform.angle();
86        break;
87    }
88}
89
90SVGTransformDistance SVGTransformDistance::scaledDistance(float scaleFactor) const
91{
92    switch (m_type) {
93    case SVGTransform::SVG_TRANSFORM_MATRIX:
94        ASSERT_NOT_REACHED();
95#if ASSERT_DISABLED
96        FALLTHROUGH;
97#endif
98    case SVGTransform::SVG_TRANSFORM_UNKNOWN:
99        return SVGTransformDistance();
100    case SVGTransform::SVG_TRANSFORM_ROTATE:
101        return SVGTransformDistance(m_type, m_angle * scaleFactor, m_cx * scaleFactor, m_cy * scaleFactor, AffineTransform());
102    case SVGTransform::SVG_TRANSFORM_SCALE:
103        return SVGTransformDistance(m_type, m_angle * scaleFactor, m_cx * scaleFactor, m_cy * scaleFactor, AffineTransform(m_transform).scale(scaleFactor));
104    case SVGTransform::SVG_TRANSFORM_TRANSLATE: {
105        AffineTransform newTransform(m_transform);
106        newTransform.setE(m_transform.e() * scaleFactor);
107        newTransform.setF(m_transform.f() * scaleFactor);
108        return SVGTransformDistance(m_type, 0, 0, 0, newTransform);
109    }
110    case SVGTransform::SVG_TRANSFORM_SKEWX:
111    case SVGTransform::SVG_TRANSFORM_SKEWY:
112        return SVGTransformDistance(m_type, m_angle * scaleFactor, m_cx * scaleFactor, m_cy * scaleFactor, AffineTransform());
113    }
114
115    ASSERT_NOT_REACHED();
116    return SVGTransformDistance();
117}
118
119SVGTransform SVGTransformDistance::addSVGTransforms(const SVGTransform& first, const SVGTransform& second, unsigned repeatCount)
120{
121    ASSERT(first.type() == second.type());
122
123    SVGTransform transform;
124
125    switch (first.type()) {
126    case SVGTransform::SVG_TRANSFORM_MATRIX:
127        ASSERT_NOT_REACHED();
128#if ASSERT_DISABLED
129        FALLTHROUGH;
130#endif
131    case SVGTransform::SVG_TRANSFORM_UNKNOWN:
132        return SVGTransform();
133    case SVGTransform::SVG_TRANSFORM_ROTATE: {
134        transform.setRotate(first.angle() + second.angle() * repeatCount, first.rotationCenter().x() + second.rotationCenter().x() * repeatCount, first.rotationCenter().y() + second.rotationCenter().y() * repeatCount);
135        return transform;
136    }
137    case SVGTransform::SVG_TRANSFORM_TRANSLATE: {
138        float dx = first.translate().x() + second.translate().x() * repeatCount;
139        float dy = first.translate().y() + second.translate().y() * repeatCount;
140        transform.setTranslate(dx, dy);
141        return transform;
142    }
143    case SVGTransform::SVG_TRANSFORM_SCALE: {
144        FloatSize scale = second.scale();
145        scale.scale(repeatCount);
146        scale += first.scale();
147        transform.setScale(scale.width(), scale.height());
148        return transform;
149    }
150    case SVGTransform::SVG_TRANSFORM_SKEWX:
151        transform.setSkewX(first.angle() + second.angle() * repeatCount);
152        return transform;
153    case SVGTransform::SVG_TRANSFORM_SKEWY:
154        transform.setSkewY(first.angle() + second.angle() * repeatCount);
155        return transform;
156    }
157    ASSERT_NOT_REACHED();
158    return SVGTransform();
159}
160
161SVGTransform SVGTransformDistance::addToSVGTransform(const SVGTransform& transform) const
162{
163    ASSERT(m_type == transform.type() || transform == SVGTransform());
164
165    SVGTransform newTransform(transform);
166
167    switch (m_type) {
168    case SVGTransform::SVG_TRANSFORM_MATRIX:
169        ASSERT_NOT_REACHED();
170#if ASSERT_DISABLED
171        FALLTHROUGH;
172#endif
173    case SVGTransform::SVG_TRANSFORM_UNKNOWN:
174        return SVGTransform();
175    case SVGTransform::SVG_TRANSFORM_TRANSLATE: {
176        FloatPoint translation = transform.translate();
177        translation += FloatSize::narrowPrecision(m_transform.e(), m_transform.f());
178        newTransform.setTranslate(translation.x(), translation.y());
179        return newTransform;
180    }
181    case SVGTransform::SVG_TRANSFORM_SCALE: {
182        FloatSize scale = transform.scale();
183        scale += FloatSize::narrowPrecision(m_transform.a(), m_transform.d());
184        newTransform.setScale(scale.width(), scale.height());
185        return newTransform;
186    }
187    case SVGTransform::SVG_TRANSFORM_ROTATE: {
188        FloatPoint center = transform.rotationCenter();
189        newTransform.setRotate(transform.angle() + m_angle, center.x() + m_cx, center.y() + m_cy);
190        return newTransform;
191    }
192    case SVGTransform::SVG_TRANSFORM_SKEWX:
193        newTransform.setSkewX(transform.angle() + m_angle);
194        return newTransform;
195    case SVGTransform::SVG_TRANSFORM_SKEWY:
196        newTransform.setSkewY(transform.angle() + m_angle);
197        return newTransform;
198    }
199
200    ASSERT_NOT_REACHED();
201    return SVGTransform();
202}
203
204bool SVGTransformDistance::isZero() const
205{
206    return m_transform.isIdentity() && !m_angle;
207}
208
209float SVGTransformDistance::distance() const
210{
211    switch (m_type) {
212    case SVGTransform::SVG_TRANSFORM_MATRIX:
213        ASSERT_NOT_REACHED();
214#if ASSERT_DISABLED
215        FALLTHROUGH;
216#endif
217    case SVGTransform::SVG_TRANSFORM_UNKNOWN:
218        return 0;
219    case SVGTransform::SVG_TRANSFORM_ROTATE:
220        return sqrtf(m_angle * m_angle + m_cx * m_cx + m_cy * m_cy);
221    case SVGTransform::SVG_TRANSFORM_SCALE:
222        return static_cast<float>(sqrt(m_transform.a() * m_transform.a() + m_transform.d() * m_transform.d()));
223    case SVGTransform::SVG_TRANSFORM_TRANSLATE:
224        return static_cast<float>(sqrt(m_transform.e() * m_transform.e() + m_transform.f() * m_transform.f()));
225    case SVGTransform::SVG_TRANSFORM_SKEWX:
226    case SVGTransform::SVG_TRANSFORM_SKEWY:
227        return m_angle;
228    }
229    ASSERT_NOT_REACHED();
230    return 0;
231}
232
233}
234